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If these locations are not known, we need to use an estimation based on the information that we do have. The more unformation we have, the better the estimate will be.
 
If these locations are not known, we need to use an estimation based on the information that we do have. The more unformation we have, the better the estimate will be.
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==== No info ====
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Without any additional info, there is not much to estimate. We know that it will be on average half the circumference of the world and probably much less. And this will also imply that the product is transported by sea and/or air.
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==== Purchase country ====
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If we know the country where the product was bought, we can make two assumptions:
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* product is also produced in the country;
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* product will be consumed in the purchase country;
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We can then take an average transportation route of half the size of the country. This will also imply a route by road.
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==== Production country ====
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If in addition to the purchase country, we also know the production country, we can determine the route between both countries. This might involve transport by road, air or sea. Which transport means is used will also depend on the product category.
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As we do not know the exact location of production or consumption, we need to use the geographic center of a country as an approximation.
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==== Locations ====
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If either the purchase (consumption) or production locations are known, we can perform a more detailed calculation based on the the two locations and/or geographical centers.
    
=== Transport environmental impact ===
 
=== Transport environmental impact ===
    
== Calculation method ==
 
== Calculation method ==
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